Change testscene interface

ray-tracing-scene/src/triangle_bvh.rs

@@ -4,6 +4,7 @@ use ray_tracing_core::{
     scene::{Intersection, LightSample, Scene},
 };
 use sampling::sample_triangle;
+use std::sync::Arc;
 
 type Index = u32;
 
@@ -11,11 +12,23 @@ type Index = u32;
 pub struct TriangleBVH<R: Rng> {
     vertices: Vec<Pos3>,
     triangles: Vec<Triangle>,
-    materials: Vec<BVHMaterial<R>>,
+    materials: Arc<[BVHMaterial<R>]>,
     bvh: Vec<Node>,
     lights: Vec<Triangle>,
 }
 
+impl<R: Rng> Clone for TriangleBVH<R> {
+    fn clone(&self) -> Self {
+        Self {
+            vertices: self.vertices.clone(),
+            triangles: self.triangles.clone(),
+            materials: Arc::clone(&self.materials),
+            bvh: self.bvh.clone(),
+            lights: self.lights.clone(),
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct BVHMaterial<R: Rng> {
     pub material: Option<Box<dyn Material<R>>>,
@@ -223,7 +236,7 @@ impl<R: Rng> TriangleBVH<R> {
             vertices,
             bvh,
             triangles,
-            materials,
+            materials: materials.into(),
             lights,
         }
     }